(FT/P2-6) Achievements of the Water Cooled Solid Breeder Test Blanket Module of Japan to the Milestones for Installation in ITER

D. Tsuru1), H. Tanigawa1), T. Hirose1), K. Mohri1), Y. Seki1), M. Enoeda1), K. Ezato1), S. Suzuki1), H. Nishi1), M. Akiba1)
 
1) Japan Atomic Energy Agency, Naka-city, Ibaraki, Japan

Abstract.  As the primary candidate of ITER Test Blanket Module (TBM) to be tested under the leadership of Japan, Water Cooled Solid Breeder (WCSB) TBM is being developped. Six TBMs will be tested in ITER simultaneously, under the leadership of different coutries. To ensure the installation of reliable TBMs, it is necessary to show feasibility on the TBM milestones for installation in ITER. This paper shows the recent achievements toward the milestones of ITER TBMs prior to the installation, that consist of design integration in ITER, module qualification and safety assessment. With respect to the design integration, it is necessary to show the consistency with ITER design on time with ITER design progress, targeting the detailed design final report in 2012. Structure design of the interfacing components between the WCSB TBM structure and the interfacing components (Common Frame and Backside Shielding) that are placed in a test port of ITER has been developed. The design work also consists of procedures of fabrication and replacement of TBM, the consistency with ITER port structure and TBM interface structure, and the layouts of the auxiliary systems of TBMs including the tritium extraction system and water cooling system. As for the module qualification, it is necessary to show fabrication capability and the integrity of prototypical size mockup in corresponding operation condition before the delivery of the TBM to ITER. A real scale first wall mock-up was successfully fabricated by using Hot Isostatic Pressing (HIP) method by structural material of reduced activation martensitic ferritic steel, F82H. High heat flux test with real cooling water condition is planned using this mock-up. Other essential R& Ds for the WCSB TBM also showed steady progress on investigation of mechanical behavior of breeder pebble beds, development of advanced breeder/multiplier pebble, neutron measurement technology for TBM and purge gas tritium recovery technology. As for safety milestones, preliminary safety report in 2008 and final safety assessment of individual TBMs starting from 2010 are critical. According to the requirements in the licensing process, the preliminary safety report consists of source term identification, Failure Mode and Effect Analysis (FMEA) and identification of Postulated Initiating Events (PIEs), and safety analysis.

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